HI
Yes he can pn production of proof of payment.
Pl refer FAQ on ESIC :
What is the benefit admissible after retirement of an employee?
An insured person who leaves the insurable employment on attaining the age of superannuation or retires under a voluntary Retirement Scheme or takes premature retirement , after being an insured person for not less than 5 years, shall be eligible to receive medical benefit for himself and his spouse
subject to production of proof thereof, and payment of a nominal contribution of rupees one hundred and twenty for one year. In case the insured person expires, his spouse is entitled to the medical benefit for the remaining period for which the contribution was made, and she can continue to received the medical benefit on payment of the contribution @ 120/p.a. for further period. This medical benefit is also admissible to an insured person who ceases to be in employment on account of permanent disablement caused due to employment injury for himself and his spouse on payment of similar contribution till the date on which he would have vacated the employment on attaining the age of
superannuation, had he not sustained such permanent disablement.
Thanks!!